video1.0<iframe src="https://www.loom.com/embed/09e6cb6336e044d981bb85c9b60dfd74" frameborder="0" width="1920" height="1440" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>14401920Loomhttps://www.loom.com14401920https://cdn.loom.com/sessions/thumbnails/09e6cb6336e044d981bb85c9b60dfd74-44fe58e691060bc7.jpg272.79Dr. Marvin's instantaneous temperature change-inator has been causing trouble, and students have to decide whether each change can be reversed. Three experiments: frozen cocoa, a melted popsicle, and popped popcorn. This preview covers how to run each discussion so students explain their thinking with "because" instead of yelling the answer, and how to push them toward other examples of reversible and irreversible changes.